• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a detection circuit, a hybrid drive circuit and a sensor assembly. The detection circuit comprises a driving device, namely a current driving circuit and a voltage driving circuit. The current driving circuit drives a sensor in a current driving mode and the voltage driving circuit drives the sensor in a voltage drive mode. The detection circuit further comprises a switch device connected to the driver. The switch device controls the driver to allow the driver to switch between the current drive mode and the voltage drive mode. According to the present invention, a temperature sensing circuit whose main component is a negative temperature coefficient thermistor is further used to detect the ambient temperature of the sensor and the variation of the resistance of the thermistor as a function of temperature. modifies the input voltage of the switch device so as to control the transition to the conductive and nonconductive state of the switch device to switch the driving mode of the sensor. The sensor is therefore driven in different modes at different temperatures, so that the output drift of the product is reduced and the reliability of the vehicle battery management system is improved.
    公开号:FR3041437A3
    申请号:FR1658754
    申请日:2016-09-19
    公开日:2017-03-24
    发明作者:Ye Sun；Xinhui Mao；Jiacheng Zhou；Jianwu Zhou
    申请人:Tyco Electronics Shanghai Co Ltd；
    IPC主号:
    专利说明:

    SENSING CIRCUIT, HYBRID DRIVE CIRCUIT, AND ASSEMBLY
    SENSOR
    The present invention relates to a vehicle battery management system and, in particular, a detection circuit for monitoring the charge and discharge states of a battery and an associated assembly.
    For the dynamic monitoring of the charging / discharging current and the operating state of a vehicle battery, sensors are used which in turn transmit an acquired signal to a battery management system. The battery management system manages and controls the battery appropriately and efficiently in conjunction with one or more other acquired performance parameters to ensure the desired level of performance for the battery and the normal operation of the electrical equipment.
    Considering the design of an existing sensor (eg a Hall effect sensor), there is a phenomenon of zero drift at extremely high and extremely low temperatures (especially at temperatures below 0 ° C): for example, when a magnetic field is zero, an abnormal detection signal is emitted by the sensor, disturbing the operating efficiency of the vehicle battery management system.
    FIG. 1 represents curves of the zero drift of a sensor, which varies with the temperature in two driving modes: a current driving mode and a voltage driving mode, the abscissas representing the ambient temperature T ( ° C) of the sensor, and the ordinates representing the drift voltage at the output of the sensor. The broken line 101 represents the curve of the drift in current driving mode; the solid line 102 represents the curve of the drift in tension drive mode. As can be seen in FIG. 1, when the ambient temperature is lower than 50 ° C, the output drift of the sensor in current drive mode is greater than that of the sensor in voltage drive mode; in particular, when the ambient temperature is lower than -40 ° C, the drift voltage in current drive mode is 25 mV higher than it is in the voltage drive mode and, when the ambient temperature is greater than 50 ° C, the sensor output drift in current drive mode is lower than that of the sensor in voltage drive mode.
    The object of the present invention is to solve the problem of a large zero drift explained above. A first object of the present invention is to provide a detection circuit capable of switching the driving mode of a Hall effect sensor at different ambient temperatures.
    The first aspect of the invention relates to a detection circuit which may comprise a sensor and a driving device connected to the sensor for driving the sensor. The driving device comprises a current driving circuit and a voltage driving circuit. The current driving circuit drives the sensor in a current driving mode, and the voltage driving circuit drives the sensor in a voltage drive mode. The detection circuit further comprises a switch device connected to and controlling the drive device to enable the drive device to switch between the current drive mode and the voltage drive mode.
    According to the previously mentioned detection circuit, the sensor is a Hall effect sensor which detects a variation of the magnetic flux. The output quantity of the Hall effect sensor varies according to the magnetic flux.
    According to the previously mentioned detection circuit, the current driving circuit comprises a current driving path. The current drive path includes a first path segment and a second path segment. Two ends of the sensor are connected, respectively, to the first path segment and the second path segment. A current flowing in the current drive path goes from the first path segment to the sensor, passes through the path segment, and exits through the second path segment. The voltage drive circuit includes a voltage drive path. The switch device connects the voltage driver circuit in parallel to the first path segment and the second path segment to form the voltage drive path, or disconnects the voltage drive circuit from the first path segment or second segment of path.
    According to the detection circuit mentioned above, the first path segment comprises a first resistance, and the second path segment comprises a second resistance.
    According to the detection circuit mentioned above, one end of the voltage drive path is connected to the switch device, and the voltage drive path is connected in parallel to the first path segment and the second path segment by means of the device. switch.
    According to the detection circuit mentioned above, the voltage drive circuit comprises a voltage regulator tube.
    According to the detection circuit mentioned above, the switching device comprises a transistor or a metal-oxide-semiconductor (MOS) transistor.
    According to the detection circuit mentioned above, the detection device further comprises a switch control circuit, an output of the switch control circuit being connected to an input of the switch device, and the switch control circuit generating a switch control circuit. control signal in a detected ambient temperature range. In response to the control signal, the switch device goes into a conductive state or a non-conductive state. When in the conductive state, the switch device connects the voltage driver in parallel to the first path segment and the second path segment. When in the non-conductive state, the switch device disconnects the voltage drive circuit from the first path segment or the second path segment.
    According to the detection circuit mentioned above, the switch control circuit comprises a comparator and a temperature detection circuit.
    According to the detection circuit mentioned above, the comparator is provided with a first input end, a second input end, and an output end. The output end is connected to an input end of the switch device. The first input end is connected to a stable threshold voltage (VO). The second input end is connected to a detection voltage (V) supplied to the output of the temperature detection circuit.
    According to the detection circuit mentioned above, the sensor operates in a thermal drift range. The threshold voltage designates a threshold voltage that triggers the display of the control signal by the comparator when the temperature detection circuit detects that the ambient temperature is reaching the thermal drift range. The thermal drift range refers to a temperature range in which the zero drift of the sensor in the current drive mode is greater than that of the sensor in the voltage drive mode when the sensor is not traversed by any current. The zero drift designates a state in which an error signal is output from the sensor when a measured current is zero.
    According to the detection circuit mentioned above, the temperature detection circuit comprises a thermistor (R7) and several voltage division resistors (R3, R4, R5). The voltage division resistors (R3, R4, R5) comprise a third resistor (R3) and a fourth resistor (R4) which are connected in series, and a fifth resistor (R5) connected in series with the thermistor (R7). ). The first input end is connected between the third resistor (R3) and the fourth resistor (R4), so as to be connected to the threshold voltage (VO) resulting from the voltage division made by the third resistor (R3). and the fourth resistance (R4). The second input end is connected between the thermistor (R7) and the fifth resistor (R5), so as to be connected to the detection voltage (V) resulting from the voltage division made by the thermistor (R7) and the fifth resistance (R5).
    According to the aforementioned detection circuit, when the voltage drive path is disconnected from the first path segment or the second path segment, the drive device is a drive circuit operating in "current" mode. When the voltage drive path is connected in parallel with the first path segment and the second path segment, the drive device is a drive circuit operating in "voltage" mode.
    According to the detection circuit mentioned above, the detected ambient temperature range includes a first ambient temperature range and a second ambient temperature range. The comparator outputs a first level control signal in the first ambient temperature range, and, in response to the first level control signal, the switch device is turned on. The comparator outputs a second level control signal in the second ambient temperature range, and, in response to the second level control signal, the switch device switches to the non-conductive state.
    According to the detection circuit mentioned above, the first ambient temperature range is a temperature range lower than the thermal drift range. The second ambient temperature range is a temperature range greater than the thermal drift range.
    A second object of the present invention is to provide a hybrid drive circuit for driving a sensor element to operate in two drive modes. According to a second aspect of the invention, a hybrid drive circuit is used to be connected to two ends of a driven electronics element and to provide a driving power supply. The hybrid drive circuit includes a current driver, a voltage driver, a switch device, and a switch driver circuit.
    The current driving circuit comprises a first circuit segment and a second circuit segment. The first circuit segment and the second circuit segment are respectively connected at two ends of the driven electronic element and form a current driving path; the circuit segments are energized to form a path segment. The voltage drive circuit has a first end and a second end. The switch device has a first end and a second end, the second end of the voltage drive circuit being connected to the first end of the switch device. The switch control circuit provides a control signal to the switch device, and in response to the control signal, the switch device is turned on or off. The first end of the voltage drive circuit and the second end of the switch device are two output ends of the hybrid drive circuit, and these two output ends are connected to both ends of the driven electronics element. When in the conductive state, the switch device allows the voltage driver to be connected to the second end of the switch device. When in the non-conductive state, the switch device allows the voltage driver to be disconnected from the second end of the switch device.
    According to the hybrid drive circuit mentioned above, the switch device, when in the conductive state or in the non-conductive state, allows the voltage drive circuit to be connected to the first circuit segment and to the second circuit segment or to be disconnected from the first circuit segment or the second circuit segment.
    According to the hybrid drive circuit mentioned above, the hybrid drive circuit further comprises a first resistor (R1) and a second resistor (R2). The first circuit segment comprises the first resistor (R1) and the second circuit segment comprises the second resistor (R2).
    According to the hybrid drive circuit mentioned above, the switch control circuit comprises a comparator and a temperature detection circuit, and the temperature detection circuit detects an ambient temperature, and outputs a detection signal transmitted to the comparator. .
    According to the hybrid drive circuit mentioned above, the comparator is provided with a first input end, a second input end, and an output end. The output end is connected to an input end of the switch device. The first input end is connected to a stable threshold voltage (VO). The second input end is connected to a detection voltage (V) supplied to the output of the temperature detection circuit.
    According to the hybrid drive circuit mentioned above, when the ambient temperature is in a first ambient temperature range, the detection voltage (V) output is greater than the threshold voltage (VO), and the comparator transmits in outputting a first level control signal transmitted to the switch device through the output end. When the ambient temperature is in a second ambient temperature range, the detection voltage (V) is lower than the threshold voltage (VO), and the comparator outputs a second level control signal transmitted to the switch device by through the output end.
    According to the hybrid drive circuit mentioned above, the first ambient temperature range is a temperature range below a thermal drift range. The second ambient temperature range is a temperature range greater than the thermal drift range.
    According to the hybrid drive circuit mentioned above, when the comparator outputs the first level control signal, the switch device, in response to the first level control signal, switches to the conductive state. When the comparator outputs the second level control signal, the switch device, in response to the second level control signal, goes to the non-conductive state.
    According to the aforementioned hybrid drive circuit, the hybrid drive circuit further comprises a Hall effect element operating in the thermal drift range. The thermal drift range refers to a temperature range in which the zero drift of the sensor in the current drive mode is greater than that of the sensor in the voltage drive mode when the sensor is not traversed by any current. The zero drift designates a state in which an error signal is outputted by the sensor when a measured current is zero.
    According to the hybrid drive circuit mentioned above, the threshold voltage (VO) designates a threshold voltage which triggers the transmission of the control signal by the comparator when the temperature detection circuit detects that the ambient temperature reaches the range of thermal drift.
    According to the hybrid drive circuit mentioned above, the temperature detection circuit comprises a thermistor (R7) and a plurality of voltage division resistors (R3, R4, R5). The voltage division resistors (R3, R4, R5) comprise a third resistor (R3) and a fourth resistor (R4) which are connected in series, and a fifth resistor (R5) connected in series with the thermistor (R7). ). The first input end is connected between the third resistor (R3) and the fourth resistor (R4), so as to be connected to the threshold voltage (VO) resulting from the voltage division made by the third resistor (R3). and the fourth resistance (R4). The second input end is connected between the thermistor (R7) and the fifth resistor (R5), so as to be connected to the detection voltage (V) resulting from the voltage division made by the thermistor (R7) and the fifth resistance (R5).
    A third object of the present invention is to provide a sensor product. The third aspect of the invention relates to a sensor assembly comprising a sensor and the hybrid drive circuit mentioned above. The first circuit segment of the hybrid drive circuit is connected to a drive input end of the sensor, and the second circuit segment of the hybrid drive circuit is connected to another drive input end of the hybrid drive circuit. sensor.
    According to the aforementioned sensor assembly, the hybrid drive circuit is mounted on a printed circuit board (PCB).
    The present invention relates to a sensor circuit and a sensor assembly comprising a sensor and a hybrid drive circuit. The hybrid drive circuit mainly comprises a drive device (drive circuit). The driving device comprises a current driving circuit and a voltage driving circuit. The current driving circuit drives the sensor in a current driving mode and the voltage driving circuit drives the sensor in a voltage drive mode. The hybrid drive circuit further includes a switch device connected to the driver. The switch device controls the drive device to allow the driver to switch between the current drive mode and the voltage drive mode. According to the present invention, a temperature sensing circuit whose main component is a negative temperature coefficient thermistor is further used to detect the ambient temperature of the sensor, the variation of the resistance of the thermistor as a function of the temperature. altering the input voltage of the switch device to control the transition of the switch device to the conductive state and the non-conductive state to switch the driving mode of the Hall effect sensor. The sensor is therefore driven in different modes at different temperatures, so that the zero drift of the output quantity of the product is reduced and the reliability of a vehicle battery management system is improved.
    The following description is presented in connection with the attached figures, which are not necessarily to scale, the objective being rather, overall, to illustrate the principles of the invention, and in which:
    FIG. 1 represents curves of the zero drift of a sensor 201 of the state of the art, at different ambient temperatures;
    FIG. 2 is a schematic view of the basic structure of a detection circuit 200 according to the present invention;
    FIG. 3 is a schematic view of the specific configuration of the detection circuit 200 according to the present invention;
    FIG. 4 is a schematic view illustrating the result of the operation of the detection circuit 200 according to the present invention; and
    FIG. 5 is a schematic view showing the construction of a sensor assembly 500 according to the present invention.
    Various embodiments of the present invention are described below with reference to the accompanying drawings which form part of the specification. It should be understood that although directional terms such as "forward / backward", "backward / backward", "upper", "lower", "left" and "right" refer to parts and building elements of the present invention being examples, they serve here only to facilitate the description and are determined by the directions chosen by way of example in the accompanying drawings. Embodiments disclosed by the present invention may be arranged in different directions, so that these directional terms are merely illustrative and should not be construed as limiting the present invention. Identical or similar reference signs used in the present invention may, where appropriate, refer to the same components.
    FIG. 2 is a schematic view of the basic structure of a detection circuit 200 according to the present invention. As shown in FIG. 2, the sensing circuit 200 includes a sensor 201 and a driver (drive circuit) 202 (represented by a dashed line in FIG 2) connected to the sensor 201. The driver 202 provides to the sensor 201 (driven member) a voltage or drive current (excitation) to enable the sensor 201 to operate. The drive device 202 includes a current driver and a voltage driver.
    The voltage drive circuit 203 has a first end 213, a second end 214, a switch device 204, and a switch control circuit 205. The switch device 204 has a first end 216 and a second end 215, the second end 216 end 214 of the voltage driver 203 being connected to the first end 216 of the switch device 204. The switch control circuit 205 provides a control signal to the switch device 204 and, in response to the control signal, the switch device 204 goes into a conductive state or a non-conductive state. The first end 213 of the voltage drive circuit 203 and the second end 215 of the switch device 204 are two output ends 213, 215 of the drive circuit 202 and the two output ends 213, 215 are connected at two ends of the driven electronic element, namely the sensor 201. When the switch device 204 is in the conductive state, the first end 216 of the switch device 204 is connected to the second end 215 of the switch device 204, allowing the drive circuit in voltage 203 to be connected to the second end 215 of the switch device 204. When the switch device 204 is in the non-conductive state, the first end 216 of the switch device 204 is disconnected from the second end 215 of the switch device 204. allowing the voltage driving circuit 203 to be disconnected from the second end 215 of the switch device 204.
    When the two output ends 213, 215 are connected to both ends of the sensor 201 and connected to a power supply, the current flowing through the driven electronic element 201 forms the current driving circuit. The current driving circuit includes a current driving path (211, 201, 212). As also shown in FIG. 2, the current driving path (211, 201, 212) comprises a first path segment 211 and a second path segment 212. The first path segment 211 and the second path segment 212 are connected at two ends of the path segment 211. driving the driven element, namely the sensor 201. The current flowing in the current path (211, 201, 212) goes from the first path segment 211 to the sensor 201, passes through the sensor 201 and exits through the second path segment 212; in this case, the sensor 201 is driven in a current driving mode. The first path segment 211 comprises a first resistor R1, and the second path segment 212 comprises a second resistor R2.
    When the voltage drive circuit is connected to the first path segment 211 and the second path segment 212, the voltage drive circuit forms a voltage drive path (213, 203, 204, 215). Two ends of the voltage drive path (213, 203, 204, 215) are connected, respectively, to the first path segment 211 and the second path segment 212 and can be selectively disconnected from the first path segment 211 or the second path segment 212. The switch device 204 connects the voltage drive path (213, 203, 204, 215) in parallel to the first path segment 211 and the second path segment 212 or disconnects the drive path in tension (213, 203, 204, 215) of the first path segment 211 or the second path segment 212. When the voltage drive path (213, 203, 204, 215) is connected in parallel with the first path segment, path 211 and the second path segment 212, the driver 202 drives the sensor 201 in a voltage drive mode. When the voltage drive path (213, 203, 204, 215) is disconnected from the first path segment 211 or the second path segment 212, the driver 202 drives the sensor 201 according to the drive mode. current.
    The current driving circuit drives the sensor 201 according to the current driving mode and the voltage driving circuit drives the sensor 201 according to the voltage drive mode. The switch device 204 connected to the driver 202 controls the driver 202 to allow the driver 202 to switch between the current drive mode and the voltage drive mode. Due to the semiconductor properties of the sensor, the properties exhibited by the sensor in the voltage drive mode are different from the properties exhibited by the sensor in the current drive mode. For example, as shown in FIG. 1, the zero drift of a Hall effect sensor in current drive mode is different from that of the Hall effect sensor in voltage drive mode.
    The detection circuit 200 of FIG. 2 further comprises the switch control circuit 205 connected to the switch device 204. The switch control circuit 205 can sense the ambient temperature of the sensor 201 and send a control signal to the switch device 204 according to the different ambient temperatures. to allow switching of the switch device 204 to the conductive state or the nonconductive state, so as to disconnect the voltage drive circuit from the first path segment 211 or the second path segment 212 or to connect the circuit voltage driver at the first path segment 211 and at the second path segment 212. The function of the switch control circuit 205 is to change the drive mode of the sensor 201.
    In one embodiment, the driven element of the present invention is a Hall effect sensor. However, the driven element of the present invention is not limited to a Hall effect sensor; any type of driven element needing to be alternately driven in a voltage / current drive mode, for example another type of sensor, is applicable to the circuits of the drive device 202 of the present invention. .
    In addition, an output end of the sensor 201 is further connected to an amplifier circuit (a transistor) 210 used to amplify an output signal VH of the sensor 201.
    FIG. 3 is a schematic view of a specific circuit configuration of the detection circuit 200 according to the present invention. As the FiG shows. 3, the detection circuit 200 essentially comprises a current driver and a voltage driver. The current driving circuit comprises a current driving path (211, 201, 212) which essentially comprises a first resistor R1, a first path segment 211, a sensor 201, a second path segment 212 and a second path segment. resistor R2 connected in series in FIG. 3. Two ends of the current drive path (211, 201, 212) are connected to + V and -V voltages, respectively. The operating voltage is of the order of 12 V to 18 V. The first resistor R1 and the second resistor R2 intervene in the division of the voltage.
    The sensor 201 has four pins, namely an upper pin 331, a lower pin 332, a right pin 333, and a left pin 334, among which the upper pin 331 (an input end) is connected to the first path segment 211, and the lower pin 332 (an output end) is connected to the second path segment 212; the right pin 333 and the left pin 334 are output ends of a detection signal and are connected to an input end of an amplifier circuit (a transistor) 210.
    The voltage drive circuit comprises a voltage drive path (213, 203, 204, 215) which includes a first end 213, a voltage regulator tube 309 (203 in Fig. 2), a switch device 204 , and a second end 215. The first end 213 and the second end 215 are connected, respectively, to the first path segment 211 and the second path segment 212. The switch device 204 is connected between the voltage regulator tube 309 and the second end 215 in FIG. 3. In fact, the switch device 204 may be connected to any other position of the voltage drive path (213, 203, 204, 215), for example between the first end 213 and the voltage regulator tube 309. , provided that the switch device 204 can control the opening or closing of the voltage drive path (213, 203, 204, 215). The negative electrode of the voltage regulator tube 309 is on the side of the first end 213, and the positive electrode of the sensor regulator tube 309 is on the side of the second end 215. When the voltage drive path (213 , 203, 204, 215) is closed and connected to the first path segment 211 and the second path segment 212, the voltage drive path (213, 203, 204, 215) is a constant voltage drive circuit having a voltage lower (or equal) to 2V.
    The switch device 204 is a transistor 311 or a MOS transistor. The drain and source of the transistor 311 are connected to the voltage drive path (213, 203, 204, 215) and the input end, i.e. the gate, of the transistor 311 is connected to a switch control circuit 205. When the switch control circuit 205 outputs a control signal (e.g., a high level control signal) transmitted to the input end of the transistor 311, the drain and the source of the switch device 204 is in a conductive state, and the voltage drive path (213, 203, 204, 215) is then closed and connected to the current drive path (211, 201, 212); conversely, when the switch control circuit 205 emits no output control signal to the input end of the transistor 311, the drain and source of the switch device 204 are in a non-conductive state , and the voltage drive path (213, 203, 204, 215) is then open and therefore can not be connected to the current drive path (211, 201, 212).
    The switch control circuit 205 includes a comparator 308 and a temperature sensing circuit 307. The comparator 308 is provided with a first input end 320, a second input end 321, and a second end. output 323. The output end 323 is connected to the input end of the switch device 204 (the transistor 311). The first input end 320 is connected to a stable threshold voltage V0. The second input end 321 is connected to a detection voltage V delivered to the output of the temperature detection circuit 307. The temperature detection circuit 307 comprises a thermistor R7 and a plurality of voltage division resistors R3, R4, R5 . The voltage dividing resistors R3, R4, R5 comprise a third resistor R3 and a fourth resistor R4 which are connected in series, and a fifth resistor R5 connected in series with the thermistor R7. The first input end 320 is connected between the third resistor R3 and the fourth resistor R4, so as to be connected to the threshold voltage V0 resulting from the voltage division caused by the different resistances of the third resistor R3 and the resistor R3. fourth resistance R4. The second input end 321 is connected between the thermistor R7 and the fifth resistor R5, so as to be connected to the detection voltage V resulting from the voltage division caused by the different resistances of the thermistor R7 and the fifth resistor R5. When the resistance of the thermistor R7 varies, the detection voltage V resulting from the voltage division made by the thermistor R7 and the fifth resistor R5 also varies. When the detection voltage V is greater than the threshold voltage VO, the comparator 308 outputs a high level control signal transmitted to the input end of the transistor 311, so that the drain and the source of the transistor 311 are connected, which means that the switch device 204 is turned on.
    The resistance of thermistor R7 varies depending on the ambient temperature. When the ambient temperature decreases, the resistance of the thermistor R7 increases, and vice versa.
    In the present invention, the Hall effect sensor 201 is driven in a current drive mode at normal temperature, but when the ambient temperature is too low (below 0 ° C as in Fig. 1), the The output drift of the Hall effect sensor 201 increases, and in this case, it is necessary to switch to a voltage drive mode of the Hall effect sensor 201 so as to reduce drift. The temperature range in which the drift is too large is the thermal drift range of the present invention. According to the present invention, the thermistor R7 is used to detect the thermal drift range of the Hall effect sensor 201 and, when the temperature reaches (or approaches) the thermal drift range, the switch control circuit outputs a control signal, and the drive device 202 operates a switch to operate the voltage drive circuit.
    According to the present invention, the threshold voltage V0 is regulated by means of the different resistances of the third resistor R3 and the fourth resistor R4, and the value of the threshold voltage V0 is determined according to the thermistor R7, the comparator 308 and the Heat drift range of the Hall effect sensor 201. When the thermistor R7 detects that the ambient temperature of the Hall effect sensor 201 reaches the thermal drift range, the resistance of the thermistor R7 increases and, when the detection voltage V increases, passes over the threshold voltage V0, the comparator 308 transmits a control signal transmitted to the transistor 311 to trigger the closing of the voltage drive path (213, 203, 204, 215).
    FIG. 4 is a schematic view illustrating the result of the operation of the detection circuit 200 according to the invention. According to the drift curves shown in FIG. 1, when the ambient temperature is greater than 50 ° C, the drift of an output variable 1c of a Hall effect sensor 201 in current driving mode is small; when the temperature is below 50 ° C, the drift of an output variable Vc of the Hall effect sensor 201 in voltage drive mode is low; and, in particular, when the temperature is below 0 ° C., the drift of the output quantity of the Hall effect sensor 201 in the current drive mode is much greater than the drift of the output variable Vc of the sensor Hall effect 201 in voltage drive mode. Therefore, when the temperature drops to 50 ° C, you must change the drive mode of the Hall sensor and switch to the voltage drive mode.
    As shown in FIG. 4, when the temperature is above 50 ° C, the Hall effect sensor 201 is driven by a current driver and the output of the Hall effect sensor 201 is lc (represented by a dashed line) ; and when the temperature is below 50 ° C, a switch is made for the Hall effect sensor 201 to be driven by a voltage driver, and the output of the Hall effect sensor 201 is Vc (shown in FIG. by a solid line). In this way, the Hall effect sensor can always operate with minimal output drift, which improves the operating stability of the sensor.
    Switching the drive mode to 50 ° C, as mentioned above, is an ideal embodiment, but in fact the switching of the drive mode is determined by the difference between the output quantities of the pickup sensor. Hall effect 201 in both modes. For example, in FIG. 1, in a temperature range corresponding to 50 ° C plus or minus 10 ° C (i.e., between 40 ° C-60 ° C), the difference between the output quantities of the Hall effect sensor 201 in current drive mode and voltage drive mode is not important, and if this small difference does not prevent the Hall effect sensor 201 from functioning normally, it is not necessary to switch the mode of operation. 'training. The size of the difference is determined according to the needs of a customer.
    FIG. 5 is a schematic view of the construction of a sensor assembly 500 according to the present invention. As shown in FIG. 5, a driving device 202 of a sensor 201 of the present invention is incorporated in an integrated chip 530, the sensor 201 and the integrated chip 530 being both mounted on a printed circuit board 520. The sensor assembly 500 includes a housing 510 and constitutes a high integration degree assembly.
    It is to be understood that although the present invention is described with reference to the embodiments shown in the accompanying drawings, it is possible to make various modifications to the detection circuit, the hybrid drive circuit and the sensor assembly of the present invention without departing from the spirit and scope of the present invention. Those skilled in the art may also appreciate that various modifications to the parameters in the embodiments disclosed by the present invention are all within the spirit and scope of the present invention and the claims.
    权利要求:
    Claims (28)
    [1" id="c-fr-0001]
    1. A detection circuit (200), characterized in that it comprises: a sensor (201); and a driver (202) connected to the sensor (201), wherein the driver (202) is used to drive the sensor (201), wherein the driver (202) includes a driver circuit (202). current driver and a voltage driver (203); the current driving circuit drives the sensor (201) in a current driving mode, and the voltage driving circuit (203) drives the sensor (201) in a voltage drive mode; and a switch device (204) coupled to and controlling the drive device (202) to enable the drive device (202) to switch between the current drive mode and the voltage drive mode .
    [2" id="c-fr-0002]
    2. Detection circuit (200) according to claim 1, characterized in that: the sensor (201) is a Hall effect sensor, the Hall effect sensor detects a magnetic flux variation, and an output variable of the sensor to Hall effect varies with changes in magnetic flux.
    [3" id="c-fr-0003]
    The detection circuit (200) according to claim 1, characterized in that: the current driving circuit comprises a current driving path (211, 201, 212), the current driving path (211), , 201, 212) comprises a first path segment (211) and a second path segment (212), and two ends of the sensor (201) are connected, respectively, to the first path segment (211) and the second path segment (211). path (212); a current flowing in the current path (211, 201, 212) goes from the first path segment (211) to the sensor (201), passes through the sensor (201), and exits through the second path segment (212). ); the voltage drive circuit (203) comprises a voltage drive path (213, 203, 215); and the switch device (204) connects the voltage driver (203) in parallel to the first path segment (211) and the second path segment (212) to form the voltage drive path (213, 203 , 215), or disconnects the voltage drive circuit (203) from the first path segment (211) or the second path segment (212).
    [4" id="c-fr-0004]
    4. A detection circuit (200) according to claim 3, characterized in that: the first path segment (211) comprises a first resistor (R1), and the second path segment (212) comprises a second resistor (R2) .
    [5" id="c-fr-0005]
    The detection circuit (200) according to claim 3, characterized in that: one end of the voltage drive path (213, 203, 215) is connected to the switch device (204), and the drive path in voltage (213, 203, 215) is connected in parallel with the first path segment (211) and the second path segment (212) by means of the switch device (204).
    [6" id="c-fr-0006]
    The detection circuit (200) according to claim 1, characterized in that: the voltage drive circuit (203) comprises a voltage regulator tube (309).
    [7" id="c-fr-0007]
    7. A detection circuit (200) according to claim 1, characterized in that: the switch device (204) comprises a transistor (311) or a metal-oxide-semiconductor transistor (MOS).
    [8" id="c-fr-0008]
    The detection circuit (200) according to claim 3, characterized in that it further comprises: a switch control circuit (205), an output of the switch control circuit (205) being connected to an input of the switch device (204), and the switch control circuit (205) generating a control signal in a detected ambient temperature range, wherein, in response to the control signal, the switch device (204) enters a state driver or a non-conductive state; in the conductive state, the switch device (204) connects the voltage driver (203) in parallel with the first path segment (211) and the second path segment (212); and in the non-conductive state, the switch device (204) disconnects the voltage drive circuit (203) from the first path segment (211) or second path segment (212).
    [9" id="c-fr-0009]
    The sensing circuit (200) according to claim 8, characterized in that: the switch control circuit (205) comprises a comparator (308) and a temperature sensing circuit (307).
    [10" id="c-fr-0010]
    The detection circuit (200) according to claim 9, characterized in that: the comparator (308) is provided with a first input end (320), a second input end (321), and an output end (323); the output end (323) is connected to an input end of the switch device (204); the first input end (320) is connected to a stable threshold voltage (V0); and the second input end (321) is connected to a sense voltage (V) outputted to the output of the temperature sensing circuit (307).
    [11" id="c-fr-0011]
    The detection circuit (200) according to claim 10, characterized in that: the sensor (201) operates in a thermal drift range; the threshold voltage (V0) denotes a threshold voltage which triggers the transmission of the control signal by the comparator (308) when the temperature detection circuit (307) detects that the ambient temperature is reaching the thermal drift range; the thermal drift range means a temperature range in which the zero drift of the sensor (201) in the current drive mode is greater than that of the sensor (201) in the voltage drive mode when the sensor (201) is not crossed by any costumers; and zero drift means a state in which an error signal is output from the sensor (201) when a measured current is zero.
    [12" id="c-fr-0012]
    The sensing circuit (200) according to claim 10, characterized in that: the temperature sensing circuit (307) comprises a thermistor (R7) and a plurality of voltage division resistors (R3, R4, R5); the voltage division resistors (R3, R4, R5) comprise a third resistor (R3) and a fourth resistor (R4) which are connected in series, and a fifth resistor (R5) connected in series with the thermistor (R7 ); the first input end (320) is connected between the third resistor (R3) and the fourth resistor (R4), so as to be connected to the threshold voltage (V0) resulting from the voltage division made by the third resistor (R3) and the fourth resistance (R4); and the second input end (321) is connected between the thermistor (R7) and the fifth resistor (R5), so as to be connected to the detection voltage (V) resulting from the voltage division made by the thermistor ( R7) and the fifth resistance (R5).
    [13" id="c-fr-0013]
    The detection circuit (200) according to any one of claims 2 to 12, characterized in that: when the voltage driving path (213, 203, 215) is disconnected from the first path segment (211) or of the second path segment (212), the drive device (202) is a drive circuit operating in "current" mode; and when the voltage drive path (213, 203, 215) is connected in parallel to the first path segment (211) and the second path segment (212), the drive device (202) is a path circuit. 'drive operating in' voltage 'mode.
    [14" id="c-fr-0014]
    The sensing circuit (200) of claim 8, characterized in that: the detected ambient temperature range includes a first ambient temperature range and a second ambient temperature range; the comparator (308) outputs a first level control signal in the first ambient temperature range and, in response to the first level control signal, the switch device (204) switches to the conductive state; and the comparator (308) outputs a second level control signal in the second ambient temperature range and, in response to the second level control signal, the switch device (204) switches to the non-conductive state.
    [15" id="c-fr-0015]
    The detection circuit (200) according to claim 14, characterized in that: the first ambient temperature range is a temperature range below the thermal drift range; and the second ambient temperature range is a temperature range greater than the thermal drift range.
    [16" id="c-fr-0016]
    Hybrid drive circuit (202) used to be connected to two ends of a driven electronics element (201) and to provide drive power supply, characterized in that it comprises: a drive circuit in current, a voltage drive circuit (203), a switch device (204), and a switch control circuit (205), wherein the current drive circuit comprises a first circuit segment (211) and a second circuit segment (212), and the first circuit segment (211) and the second circuit segment (212) are connected, respectively, to two ends of the driven electronics element (201) and form a path path. current training; the voltage drive circuit (203) has a first end (213) and a second end (214); the switch device (204) has a first end (216) and a second end (215), and the second end (214) of the voltage drive circuit (203) is connected to the first end (216) of the switch device (204); the switch control circuit (205) provides a control signal to the switch device (204), and the switch device (204), in response to the control signal, goes into a conductive state or a non-conductive state; the first end (213) of the voltage driver (203) and the second end (215) of the switch device (204) are two output ends (213, 215) of the hybrid drive circuit (202), and the two output ends (213, 215) are connected to both ends of the driven electronics element (201); in the conductive state, the switch device (204) allows the voltage driver (203) to be connected to the second end (215) of the switch device (204); and in the nonconductive state, the switch device (204) allows the voltage driver (203) to be disconnected from the second end (215) of the switch device (204).
    [17" id="c-fr-0017]
    Hybrid drive circuit (202) according to claim 16, characterized in that: the switch device (204), when in the conductive state or in the non-conducting state, allows the circuit of voltage drive (203) to be connected to the first circuit segment (211) and the second circuit segment (212) or disconnected from the first circuit segment (211) or the second circuit segment (212).
    [18" id="c-fr-0018]
    Hybrid drive circuit (202) according to claim 16, characterized in that it further comprises a first resistor (R1) and a second resistor (R2), wherein the first circuit segment (211) comprises the first resistor (R1), and the second circuit segment (212) comprises the second resistor (R2).
    [19" id="c-fr-0019]
    Hybrid drive circuit (202) according to claim 16, characterized in that: the switch control circuit (205) comprises a comparator (308) and a temperature detection circuit (307), and the temperature detection (307) detects an ambient temperature and outputs a detection signal transmitted to the comparator (308).
    [20" id="c-fr-0020]
    Hybrid drive circuit (202) according to claim 19, characterized in that: the comparator (308) is provided with a first input end (320), a second input end (321) , and an output end (323); the output end (323) is connected to an input end of the switch device (204); the first input end (320) is connected to a stable threshold voltage (V0); and the second input end (321) is connected to a sense voltage (V) outputted to the output of the temperature sensing circuit (307).
    [21" id="c-fr-0021]
    Hybrid drive circuit (202) according to claim 20, characterized in that: when the ambient temperature is in a first ambient temperature range, the detection voltage (V) output is greater than the voltage of threshold - (V0), and the comparator (308) outputs a first level control signal transmitted to the switch device (204) through the output end (323); and when the ambient temperature is in a second ambient temperature range, the sense voltage (V) is lower than the threshold voltage (V0), and the comparator (308) outputs a second level control signal transmitted to the switch device (204) via the output end (323).
    [22" id="c-fr-0022]
    22. Hybrid drive circuit (202) according to claim 21, characterized in that: the first ambient temperature range is a temperature range below a thermal drift range; and the second ambient temperature range is a temperature range greater than the thermal drift range.
    [23" id="c-fr-0023]
    Hybrid drive circuit (202) according to claim 21, characterized in that: when the comparator (308) outputs the first level control signal, the switch device (204), in response to the first signal of level control, switches to the conductive state; and when the comparator (308) outputs the second level control signal, the switch device (204), in response to the second level control signal, changes to the non-conductive state.
    [24" id="c-fr-0024]
    Hybrid drive circuit (202) according to claim 22, characterized in that it further comprises a Hall effect element operating in the thermal drift range, the thermal drift range designating a temperature range in the thermal drift range. wherein the zero drift of the sensor (201) in the current driving mode is greater than that of the sensor (201) in the voltage drive mode when the sensor (201) is not traversed by any current; and the zero drift designating a state in which an error signal is outputted by the sensor (201) when a measured current is zero.
    [25" id="c-fr-0025]
    Hybrid drive circuit (202) according to claim 24, characterized in that: the threshold voltage (V0) designates a threshold voltage which triggers the transmission of the control signal by the comparator (308) when the circuit temperature sensing device (307) detects that the ambient temperature reaches the thermal drift range.
    [26" id="c-fr-0026]
    Hybrid drive circuit (202) according to claim 20, characterized in that: the temperature sensing circuit (307) comprises a thermistor (R7) and a plurality of voltage division resistors (R3, R4, R5); the voltage division resistors (R3, R4, R5) comprising a third resistor (3) and a fourth resistor (R4) which are connected in series, and a fifth resistor (R5) connected in series with the thermistor (R7 ); the first input end (320) is connected between the third resistor (R3) and the fourth resistor (R4), so as to be connected to the threshold voltage (V0) resulting from the voltage division made by the third resistor (R3) and the fourth resistance (R4); and the second input end (321) is connected between the thermistor (R7) and the fifth resistor (R5), so as to be connected to the detection voltage (V) resulting from the voltage division made by the thermistor ( R7) and the fifth resistance (R5).
    [27" id="c-fr-0027]
    27. Sensor assembly (500), characterized in that it comprises: a sensor (201); and the hybrid drive circuit (202) according to any one of claims 16 to 26, wherein the first circuit segment (211) of the hybrid drive circuit (202) is connected to an input end of driving the sensor (201), and the second circuit segment (212) of the hybrid drive circuit (202) is connected to another driving input end of the sensor (201).
    [28" id="c-fr-0028]
    Sensor assembly (500) according to claim 27, characterized in that: the hybrid drive circuit (202) is mounted on a printed circuit board (PCB) (520).
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    同族专利:
    公开号 | 公开日
    KR20170001184U|2017-03-31|
    DE202016105171U1|2016-11-30|
    FR3041437B3|2017-11-03|
    US10343543B2|2019-07-09|
    US20170080820A1|2017-03-23|
    CN204915554U|2015-12-30|
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    法律状态:
    2017-09-25| PLFP| Fee payment|Year of fee payment: 2 |
    2018-08-13| PLFP| Fee payment|Year of fee payment: 3 |
    2019-08-15| PLFP| Fee payment|Year of fee payment: 4 |
    2020-08-12| PLFP| Fee payment|Year of fee payment: 5 |
    2021-08-12| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201520726421.2U|CN204915554U|2015-09-18|2015-09-18|Sensor circuit, hybrid -driven circuit and inductor subassembly|
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